如何在使用oracle函数时将参数作为CLOB传递给mybatis？

Question

I'm trying to put a lengthy WKT (a long string about geographical info) into an oracle spatial function SDO_GEOMETRY to transform WKT into oracle geometry type using mybatis. There are no column in the database that stores the WKT, it is only used as a parameter in the said function. The java type of the item is String , when I try to put it in it would return error, saying String too long. This indicates that the string is not being turned into a CLOB. How do I do that?

I tried using this at the start of mybatis .xml file:

<resultMap type="example.Building" id="BaseResultMap">
        <result property="geom" column="geom" jdbcType="CLOB"
                javaType = "java.lang.String"  typeHandler ="example.Utils.OracleClobTypeHandler"/>
    </resultMap>

and I have an OracleClobTypeHandler class set up.

I also tried using #{wkt,jdbcType=CLOB} but that went nowhere.

EDIT: This is the SetParameter method in the OracleClobTypeHandler :

    @Override
    public void setParameter(PreparedStatement arg0, int arg1, Object arg2, JdbcType arg3) throws SQLException {
        CLOB clob = CLOB.getEmptyCLOB();
        clob.setString(1, (String) arg2);
        arg0.setClob(arg1, clob);
    }

Answer 1

<resultMap /> is irrelevant as it is used when mapping query result to Java object.
Try specifying typeHandler in the parameter reference. eg
#{wkt,typeHandler=example.Utils.OracleClobTypeHandler}

Note that if the type handler is an inner class of Utils , it has to be referenced as example.Utils$OracleClobTypeHandler instead.